QUANTUM DIALOGUE PROTOCOL USING SIX QUBIT CLUSTER STATES WITH OPTIMAL SUPERDENSE CODING

By utilizing the attributes of a cluster state, a quantum dialogue protocol using a six qubit cluster state is put forward, which employs the idea of superdense coding to achieve maximal efficiency and high resource capacity. In our protocol, two users can simultaneously exchange five qubits of secret messages by using only three qubits for encoding. This protocol's superdense coding capacity is Holevo constrained and can be achieved with the current approaches. It guarantees a high level of security because it considers specific eavesdropping attacks while avoiding data leaking. The new scheme outperforms the existing one in terms of efficiency.